JP3272345B2 - Regeneration of slide gate plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to regeneration of a molten metal flow control member of a molten steel discharging device mounted on a lower part of a molten steel container, and more particularly to a method of regenerating a slide gate plate.

[0002]

2. Description of the Related Art A molten metal discharge device mounted on a lower portion of a molten steel container is often provided with a molten metal flow control device for adjusting or stopping the discharge of molten steel in the molten steel container. The flow rate control is performed by making the nozzle holes of the sliding plate and the fixed plate contained therein coincide with or different from each other. The sliding plate and the fixed plate here constitute a slide gate and constitute an important part of the device.

In the past, as shown in FIG. 5, a fixed plate 1 and a slide plate 2 of the two-plate type slide gate plate having the same thickness have been used for a long time. In addition, Shokai 5
As shown in FIG. 6, the upper and lower fixed plates 3 and 4 having the same thickness have also been used in a three-slide type slide gate plate as disclosed in Japanese Patent Application No. 0-101514. If these parts are damaged by use, the two-plate method employs an all-exchange method in which all plates are replaced with new ones at a time, and the three-sheet method employs a method in which sliding plates between fixed plates are replaced. It has been done.

[0004] In a fixed plate or a sliding plate whose sliding surface is worn by use, even if the sliding surface is polished and reused, the plate itself is thinned by polishing, and an appropriate sliding surface pressure is obtained. This was not possible due to the risk of steel leakage between the plates.

However, since the slide plate is expensive and used in a severe environment, the slide plate is severely damaged, and there is a strong demand for the reuse of the slide plate from the viewpoint of cost. In particular, it is uneconomical to discard the entire slide plate when only the sliding surface is damaged.

[0006] To solve such a problem, Japanese Utility Model Publication No. 57
No. 36364 has been proposed. This technology replaces the left and right sides of the sliding plate provided for the fixed plate when it is worn for a predetermined period of time, so that the fixed plate and the sliding plate are in sliding contact with each other with the new surface. Things.

However, even if the sliding contact surface of the plate was damaged by use, the plate could not be regenerated, and there was still no good solution for regenerating the plate.

For this reason, it has been considered for a long time that the plate is polished and reused. However, if the plate has a large damage, the damaged portion cannot be removed even if the plate is polished. . Therefore, the slide plate was never actually reused, and when the slide plate was worn, there was no alternative but to replace the entire slide plate with a new one.

[0009]

SUMMARY OF THE INVENTION The present invention provides a method for regenerating a slide gate plate by re-grinding and reusing the slide surface of a slide gate plate whose sliding surface has been worn after use. It is to try.

[0010]

SUMMARY OF THE INVENTION The present invention is a method for regenerating a used slide gate plate comprising a fixed plate and a sliding plate, wherein the difference in the thickness of each plate is 1.5 mm.
Polishing the sliding surface of one of the thicker fixed plate and the sliding plate of the molten metal discharging device comprising the fixed plate or the sliding plate as described above, and polishing the polished plate with the polished plate A method for regenerating a slide gate plate (Claim 1) characterized by combining a new plate similar to the above plate instead of the plate not to be inserted, and a molten metal discharging device are inserted between the upper and lower fixed plates and the middle thereof. 2. The method according to claim 1, wherein said sliding gate plate has a thickness difference between said upper and lower fixed plates of 1.5 mm or more.

[0011]

According to the present invention, the thickness of the fixed plate and the sliding plate, or the thickness of the upper and lower fixed plates is made more than 1.5 mm in the slide gate plate. Even if the sliding surface is damaged, the sliding surface of the thicker plate is polished and reused. Can be obtained economically.

[0012]

1 is a cross-sectional view of a slide gate plate according to the present invention. In FIG. 1, reference numeral 6 denotes a fixed plate, and 7 denotes a sliding plate. In the present invention, the difference between the thickness of the fixed platen 6 and the thickness of the sliding plate 7 is 1.5 mm or more.

In the embodiment shown in FIG. 1, the thickness of the fixed platen 6 is a mm.
Is a constant (hereinafter the same), (a + 2) m
m, the thickness of the sliding plate 7 is amm, and the fixed plate 6 is
2mm thicker than In the above embodiment, the fixed plate 6
Is shown as being thicker than the sliding board 7, but it is needless to say that the sliding board may be made thicker than the fixed board. Reference numeral 8 denotes a nozzle hole of the fixed plate 6, and 9 denotes a nozzle hole of the sliding plate 7.

A slide gate plate having a thickness difference between the fixed plate 6 and the slide plate 7 of 1.5 mm or more is used by being incorporated in a usual molten metal discharging device. When the sliding surface is worn out, the sliding surface of the thick fixed plate 6 in the plate is polished, and the fixed plate slightly thinned by this polishing and the discarded used sliding plate are replaced. A new sliding gate plate that is not used is combined to form a new slide gate plate, which is again incorporated in the molten metal discharging device for use.

This makes it possible to obtain a recycled slide gate plate substantially similar to a new one simply by replacing the used slide plate. As a result, the sliding plate becomes thicker than the fixed plate. However, in contrast to the above, the sliding plate was polished and reused by replacing the fixed plate with a new one. The slide gate plate is completed.
In this case, it is necessary to make the thickness of the sliding plate larger than the thickness of the fixed plate in advance.

Another use is to make the positions of the nozzle holes of the fixed plate and the sliding plate compatible, and to make the thicknesses of these plates differ by 1.5 mm or more. There is.

When this slide gate plate is used, if the sliding surface of the plate is worn, the sliding surface of the thicker plate is polished to regenerate it as a thinner plate. The thinned plate is discarded, and instead a thicker plate is combined with the plate and used in combination with the nozzle holes of the fixed plate and the sliding plate. When the sliding surface is worn again, this time, the thicker plate is polished on the sliding surface to regenerate it as a thinner plate, and the original thinner plate is discarded. Instead, a thick plate is newly prepared and used in combination by using the interchangeability of the nozzle holes of the fixed plate and the sliding plate. The same applies hereinafter.

By using this method, the present invention can be implemented by always preparing one type of plate.

The difference in thickness between the fixed plate and the sliding plate is a polishing allowance for the plate after use, but this depends on the depth of the metal container storing the plate. If the difference between the plate thicknesses is large, the thinner plate becomes thinner than the depth of the container, and the plate cannot slide. On the contrary,
If the difference in plate thickness is made too small, the polishing allowance when the plate is damaged is reduced, and the polishing becomes insufficient, making it impossible to regenerate and use it. The difference in thickness between the fixed platen and the sliding plate is 1.5 mm or more, preferably 2 to
3 mm.

FIG. 2 is a cross-sectional view of another embodiment of a three-piece slide gate plate used for a 280-ton ladle. In FIG. 2, reference numeral 10 denotes an upper fixed plate, and 11 denotes a lower fixed plate, and a sliding plate 12 is fitted between them. The thickness of the lower fixed plate is amm and the upper fixed plate is (a
+2) mm. That is, the difference in thickness between the upper fixed board and the lower fixed board is in the range of 2 to 3 mm.

As in the case of the two-plate type shown in FIG. 1, during polishing and regeneration, the upper fixed plate and the lower fixed plate may be used alternately or may not be used.

FIG. 3 shows another embodiment, in which the thickness of the plate is varied in the same manner as described above, and the molten metal flow control member is symmetrical about the nozzle hole 13 on the left and right sides. Reference numeral 14 denotes a fixed plate, and 15 is a sliding plate. In the case of reuse, this embodiment can be used by converting left and right, and can also be used by converting up and down. Then, when setting the plate again, the work can be performed without paying attention to the direction of the plate.

That is, when the sliding surface of the thicker fixed plate is polished and reused after being used for a predetermined period in the state shown in FIG. 3, it can be used as the lower slide plate. Yes, and the left and right directions may be changed. FIG. 4 shows a slide gate plate having the same thickness as described above but having a wear-resistant ring 17 fitted inside the nozzle hole of the plate 16. Regarding the fitting of a ring-shaped refractory to a plate brick, the applicant has disclosed in Japanese Patent Application Laid-Open No. 64-15 / 1988.
270 has already proposed this.

Since the nozzle hole is severely damaged by the molten steel flow, the life of the plate can be extended by fitting a wear-resistant ring here. FIG. 4 shows an example in which a ring is fitted on a three-plate type sliding plate,
Similarly, a wear-resistant ring can be fitted in the nozzle hole on the fixed plate. The material of the ring used here is preferably, for example, alumina-mullite or alumina-carbon.

In the present invention, there are various other modified examples as described below, all of which are included in the scope of the present invention.

For example, when the plates have different thicknesses as described above, the plates have a layered structure such that the plates are made of a plurality of materials in the thickness direction. In this case, a wear-resistant material suitable for the sliding surface of the plate is selected, and a two-layer or three-layer structure is formed as a material different from the other main body parts. As a result, it is possible to obtain a low-cost plate having a wear-resistant material only on the sliding surface of the plate.

When the thickness of the plate is varied as described above, the periphery of the plate may be covered with an iron skin (not shown) to prevent cracks generated in the nozzle holes of the plate from expanding. is there.

Covering the outer periphery of the plate with a steel bar is a known technique, which the applicant has already proposed in Japanese Patent Publication No. 3-69610.
Further, the slide gate plate of the present invention is not limited to a reciprocating type, and may be a rotary type.

[0029]

As described above, according to the present invention, the slide gate plate is regenerated with the fixed plate and the sliding plate having different thicknesses. If the sliding surface is damaged, the sliding surface of the thicker plate can be polished and reused, and if only the corresponding plate is replaced with a new one, it can be replaced with a new one. It will be economically regenerated.

The present invention is not limited to a set of two fixed plates and a sliding plate, but can be similarly applied to a set of three slide gate plates. Reproduction can also be expected in a plate symmetrical about the nozzle hole.

According to the present invention, the number of plates prepared according to the method of use can be reduced to one.
The life of the sheet can be substantially doubled.

In addition, by covering the periphery of the plate with an iron skin, using a sliding surface of the plate with a wear-resistant material, and fitting a erosion-resistant ring to a nozzle hole of the plate, etc. In addition to the above-described functions and effects, it is possible to expect the effects of reducing cracks of the plate, wear of the sliding surface, damage to the nozzle holes, and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a slide gate plate used in one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a slide gate plate used in another embodiment of the present invention.

FIG. 3 is a cross-sectional view of a slide gate plate used in another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a slide plate in a slide gate plate used in another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional slide gate plate.

FIG. 6 is a cross-sectional view of another conventional slide gate plate.

[Explanation of symbols]

6, 14: fixed plate, 10, 10, upper fixed plate, 11: lower fixed plate, 7, 12, 15, ... sliding plate, 8: nozzle hole of fixed plate, 9: nozzle hole of sliding plate, 17 …ring

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI F27D 3/14 F27D 3/14 C // C21C 5/46 103 C21C 5/46 103B 7/00 7/00 Q (72) Invention Toshihiro Indo Toshiba Ceramics Co., Ltd., Kariya Works 1-72 Minamito, Ogakie-cho, Kariya-shi, Aichi Prefecture (72) Inventor Masamichi Asai 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Toshiba Ceramics Co., Ltd. JP-A-58-157572 (JP, A) JP-A-64-48661 (JP, A) JP-A-48-85433 (JP, A) JP-A-58-9887 (JP, A) JP-A-61-38774 (JP, A) JP, A) JP-A-7-100633 (JP, A) JP-A-64-5659 (JP, A) JP-A-56-19970 (JP, A) Fully open Showa 50-126714 (JP, U) Fully open Showa 50-149919 (JP, U) Actually open Showa 61-41456 ( (JP, U) J. 57-36364 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 41/30 B22D 11/10 340 B22D 41/34 510 F27D 1/16 F27D 3/14 C21C 5/46 103 C21C 7/00

Claims (2)

(57) [Claims] 1. A method for regenerating a used slide gate plate comprising a used fixed plate and a sliding plate, comprising a fixed plate or a sliding plate having a difference in thickness of each plate of 1.5 mm or more. The molten metal discharger is polished on the sliding surface of one of the thicker fixed platen and sliding plate, and the same plate is used instead of the polished plate and the non-polished plate. A method for regenerating a slide gate plate, comprising combining with a new plate. 2. A molten metal flow discharge device comprising upper and lower fixed plates and a sliding plate inserted between the upper and lower fixed plates, wherein a difference in thickness between the upper and lower fixed plates is 1.5 mm or more. A method for regenerating a slide gate plate according to claim 1.